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NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 227
D. 318, sporophytes and gametophytes, rocky shore, Willard's Island,
Gonzaga Bay, Jan.; D. 410, gametophytes, rocky shore, Pond Island, Feb.
The collections of this plant from the Gulf were first identified as
Zanardinia prototypus (Nardo) Nardo (Dawson, 1941, p. 119), a species
which they resemble very closely. The discovery and investigation of an
ffAglaozonia" among the collections led, however, to the conclusion that
the plant belongs to Cutleria, a genus whose sporophyte stage has long
been known as A glaozonia. Zanardinia, on the other hand, does not have
dissimilar gametophytes and sporophytes. Close correspondence in general
aspect was found also with Cutleria adspersa (Roth) De Not. Sauva-
geau (1899, p. 298-301) has compared Cutleria adspersa and Zanardinia
prototypus (Z. collaris), which differ very little in the nature of the sterile gametophytes and has pointed out the slight distinctions. Since, however, the sporophyte is present also in the Gulf collections, comparison
could be made on two bases. Hamel (1931-1939, p. 325) discusses the
gametophyte of C. adspersa together with its sporophyte, known as A glaozonia melanoidea. The latter plant is characterized by its very dark color
and firm attachment to rock surfaces. Its size reaches several (4-8) cm.
The A glaozonia stage from the Gulf, which in one case was found growing directly at the base of the Cutleria gametophyte, and which is without
question the sporophyte of that plant, is not dark in color, is not firmly attached to the substratum, and reaches only 1.5-2 cm. in extent. Though
little can be found to distinguish the gametophyte of our species from
Cutleria adspersa, except perhaps the thin appearance of the cortical cells
in cross section, the presence of a distinctive type of sporophyte seems sufficient to establish this plant as a species new to science.
It is remarkable in being the first member of the order Cutleriales to
be positively recorded from the Pacific coast of America.
Apparently it is an ephemeral plant, and no specimens were found in
July, 1940, although special search was made at the precise spot from
which examples were taken in January. This fact would indicate a winter
annual development. All gametophytes found in January were in excellent, fresh, rapidly growing condition, all with fine trichothallic marginal
fringes.
Cutleria adspersa (Roth) De Not has been reported in Japan, but as
yet no sporophyte A glaozonia stage has been mentioned. The Japanese
plant may perhaps be the same as ours, but evidence is at present incomplete.

NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 227
D. 318, sporophytes and gametophytes, rocky shore, Willard's Island,
Gonzaga Bay, Jan.; D. 410, gametophytes, rocky shore, Pond Island, Feb.
The collections of this plant from the Gulf were first identified as
Zanardinia prototypus (Nardo) Nardo (Dawson, 1941, p. 119), a species
which they resemble very closely. The discovery and investigation of an
ffAglaozonia" among the collections led, however, to the conclusion that
the plant belongs to Cutleria, a genus whose sporophyte stage has long
been known as A glaozonia. Zanardinia, on the other hand, does not have
dissimilar gametophytes and sporophytes. Close correspondence in general
aspect was found also with Cutleria adspersa (Roth) De Not. Sauva-
geau (1899, p. 298-301) has compared Cutleria adspersa and Zanardinia
prototypus (Z. collaris), which differ very little in the nature of the sterile gametophytes and has pointed out the slight distinctions. Since, however, the sporophyte is present also in the Gulf collections, comparison
could be made on two bases. Hamel (1931-1939, p. 325) discusses the
gametophyte of C. adspersa together with its sporophyte, known as A glaozonia melanoidea. The latter plant is characterized by its very dark color
and firm attachment to rock surfaces. Its size reaches several (4-8) cm.
The A glaozonia stage from the Gulf, which in one case was found growing directly at the base of the Cutleria gametophyte, and which is without
question the sporophyte of that plant, is not dark in color, is not firmly attached to the substratum, and reaches only 1.5-2 cm. in extent. Though
little can be found to distinguish the gametophyte of our species from
Cutleria adspersa, except perhaps the thin appearance of the cortical cells
in cross section, the presence of a distinctive type of sporophyte seems sufficient to establish this plant as a species new to science.
It is remarkable in being the first member of the order Cutleriales to
be positively recorded from the Pacific coast of America.
Apparently it is an ephemeral plant, and no specimens were found in
July, 1940, although special search was made at the precise spot from
which examples were taken in January. This fact would indicate a winter
annual development. All gametophytes found in January were in excellent, fresh, rapidly growing condition, all with fine trichothallic marginal
fringes.
Cutleria adspersa (Roth) De Not has been reported in Japan, but as
yet no sporophyte A glaozonia stage has been mentioned. The Japanese
plant may perhaps be the same as ours, but evidence is at present incomplete.